The Urban Dictionary T-Shirt

A combination of "gross" and "grody." Most likely said when a person is flustered by an overwhelming characteristic of another party. Upon trying to insult said party, the first person combines the words and becomes more flustered.

Jeremy: You're grossy.
Kyle: I'm not grossy! You're grossy! I don't even know what that means!
Jeremy: It's like gross and grody. Duh.